金属氧化物和石墨烯双重修饰的新型高效Bi2WO6异质光催化剂研究

项目名称： 金属氧化物和石墨烯双重修饰的新型高效Bi2WO6异质光催化剂研究

项目编号： No.21303122

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 张国英

作者单位： 天津师范大学

项目金额： 25万元

中文摘要： Bi2WO6作为一种新型可见光光催化剂备受关注，但其有效利用仍受到两个瓶颈问题的限制，即可见光吸收范围窄和光生载流子复合速率快。鉴于此,本项目拟构筑金属氧化物MxOy和石墨烯双重修饰的Bi2WO6异质体系，选择能带匹配的窄带隙MxOy与Bi2WO6有效复合，既可拓宽催化剂的吸光范围，提高太阳能利用率，又可利用带隙耦合效应促进界面光生载流子分离。而具有超强电子传输能力石墨烯的双重修饰，可使光生电子更加快速有效地转移，从而突破MxOy单一修饰因晶相缺陷而导致的性能上限，更大程度上提高光量子效率；其巨大的比表面积还可为光催化反应提供更多活性位点。系统评价其可见光催化降解污染物的活性并揭示反应机理；借助各种光电谱学测试和理论计算深入研究MxOy和石墨烯与Bi2WO6基质的界面作用规律及机制，力争研制出高效稳定的Bi2WO6异质光催化剂。该项目对于解决环境污染和能源短缺具有重要的理论和现实意义。

中文关键词： 钨酸铋；金属氧化物；石墨烯；异质结；光催化

英文摘要： The project in the development of visible-light-active photocatalyst is of essential scientific significance and practical value to dissolve the problems of environmental pollution and energy crisis. The simplest Aurivillius-type oxide Bi2WO6 is a novel semiconductor photocatalyst which can be induced by visible light up to 460 nm and has received extensive attention. But its practicle application has been still limited by two key basic problems,that is, the narrow absorption in visible light region and the fast recombination of photogenerated holes and electrons. Based on the above-mentioned issues, Bi2WO6 heterostructure photocatalysts doubly modifed with metal oxide MxOy and graphene would be designed and fabricated. By compositing Bi2WO6 with well-matched metal oxide semiconductor, two objects can be achieved. On one hand, the visible light absorption range of Bi2WO6 can be expected to red shift due to the addition of MxOy semiconductor with narrower band gap. On the other hand, the photogenerated electron-hole would be effectively seperated for the inner electric field gnerated in the interface of heterosemicondrctor or for the effect of energy band match. By further introduction of graphen with uniquely high mobility of charge carriers to form ternary Bi2WO6 composite, the irreversible transport of excite

英文关键词： Bi2WO6；metal oxide；graphene；heterostructure；photocatalysis